KR101981344B1 - Holographic Printer for Holographic wave-front Recording by the Sub-Hogel - Google Patents
Holographic Printer for Holographic wave-front Recording by the Sub-Hogel Download PDFInfo
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- KR101981344B1 KR101981344B1 KR1020140121731A KR20140121731A KR101981344B1 KR 101981344 B1 KR101981344 B1 KR 101981344B1 KR 1020140121731 A KR1020140121731 A KR 1020140121731A KR 20140121731 A KR20140121731 A KR 20140121731A KR 101981344 B1 KR101981344 B1 KR 101981344B1
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Abstract
A holographic printer is provided for recording a holographic wavefront in sub-hogel units. In the holographic printing method according to the embodiment of the present invention, the holographic recording medium for recording the holographic wavefront is divided into a plurality of hogels, each of the plurality of hogels is divided into a plurality of sub-hogels, and a sub-hogel Records the holographic wavefront of the corresponding color, and the areas of the plurality of sub-hogels constituting one hogel may be different. As a result, the image quality of the holographic content to be recorded can be improved compared to the existing method, and the brightness of the holographic content recording can be further improved.
Description
The present invention relates to a holographic printer, and more particularly to a holographic printer and a holographic wavefront recording method for recording a holographic wavefront on a holographic recording medium.
-How to implement color in existing holographic printer
Basically, the color realization method of holographic printer uses red, green, and blue light mixed, similar to the RGB sub pixel method used in LCD, but there is a big difference.
That is, in the LCD, as shown in FIG. 2, three RGB subpixels form one pixel, but according to the SDE (Space Division Exposure) method as shown in FIG. Record only one color on the Hogel (Hologram Element: Hogel).
Of course, there is also a multi-exposure (simultaneous exposure) method in which three colors are mixed and recorded on one Hogel, but the image quality is degraded due to the crosstalk between RGB colors, and it is difficult to implement an optical system. In other words, the SDE (Space Division Exposure) method is excellent.
On the other hand, in order to record the color hologram, the diffraction efficiency for each RGB color must be matched. That way, when playing the hologram, you won't have a problem with certain colors appearing brighter.
This is because the diffraction efficiency of the medium is different for each RGB wavelength. To solve this problem, as shown in FIG. 3, the diffraction efficiency of each wavelength is determined by energy or exposure time, and then the RGB diffraction values are the same. Determine the maximum efficiency that can be achieved. That is, as shown in FIG. 3, the maximum efficiency of RGB is E1 to E3, respectively, but since the maximum efficiency at which each efficiency coincides is E1, all of the RGB have an energy (expose time) of E1.
-The first problem of the existing method (quality problem)
Conventional methods record color holograms using this SDE method, but since the Hogel size is very small and the number is large, it is hardly noticeable as LCD, so there is no big problem. However, due to the optical characteristics of the holographic printer, the Hogel size is much larger than the pixels of the LCD, which causes color quality problems.
In general, since only one of the three RGB colors to be recorded on one Hogel is selectively recorded and the other two are not recorded, as shown in FIG. 1, the colors may appear slightly separated for each RGB in certain cases. do. In other words, depending on the overall color of the content, a certain pattern may be recorded on the Hogel.
For example, when recording content with a lot of red color, this problem occurs because the amount of light in the green and blue hogels is very weak and the color of black without color is printed in a continuous pattern.
-Second problem with traditional methods (brightness problem)
Another problem arising in the existing color implementation method relates to the use of the diffraction efficiency shown in FIG. 3. In the conventional method of recording at the lowest efficiency among RGB colors, since the maximum efficiency of R and G in E3 and E3 is not used in FIG. Will result in darkening.
That is, since the maximum diffraction efficiency according to the RGB wavelength is not used and the efficiency is determined according to the minimum efficiency standard, the corresponding medium does not use the maximum brightness according to the RGB wavelength.
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to record a holographic wavefront on a hologram recording medium, and to record a holographic printer having a plurality of sub-hogel units having different areas. The present invention provides a printing method.
According to an embodiment of the present invention, a holographic printing method includes: a first dividing step of dividing a holographic recording medium for recording a holographic wavefront into a plurality of hogels; A second partitioning step of dividing each of the plurality of hogels into a plurality of sub-hogels; And recording a holographic wavefront of a corresponding color on the sub-hogels, and the areas of the plurality of sub-hogels constituting one hogel may be different from each other.
In addition, the plurality of sub-hogels constituting the one hogel may include a first sub-hogel in which a first color component is recorded, a second sub-hogel in which a second color component is recorded, and a third of the holographic wavefront. And a third sub-hogel in which the color components are recorded.
Further, the area of the first sub-hogel, the area of the second sub-hogel, and the area of the third sub-hogel may include a hologram generated by the holographic wavefront to be recorded on the hologram recording medium. In the case of projecting on a hogel composed of the furnace, the first color average value, the second color average value, and the second color average value of the projected hologram image may be determined.
In the recording step, after the recording of the sub-hogels constituting one hogel, the optical system may be moved to record the sub-hogels constituting the other hogel.
The recording step may further include: recording at the maximum efficiency of the first color on the first sub-hogel; Writing to the second sub-hogel at the maximum efficiency of the second color; And recording at the maximum efficiency of the third color on the third sub-hogel.
On the other hand, according to another embodiment of the present invention, a computer-readable recording medium comprising: a first dividing step of dividing a hologram recording medium for recording a holographic wavefront into a plurality of Hogels; A second partitioning step of dividing each of the plurality of hogels into a plurality of sub-hogels; And recording the holographic wavefronts of the corresponding color on the sub-hogels, wherein the areas of the plurality of sub-hogels constituting one hogel may be different from each other. The program that can be recorded is recorded.
As described above, according to the embodiments of the present invention, in recording the holographic wavefront in the hologram recording medium, the image quality of the holographic content to be recorded can be recorded in units of a plurality of sub-hogels having different areas. It can be improved over the method.
In addition, according to embodiments of the present invention, a plurality of sub-hogels can be recorded at maximum efficiency for each color, thereby further improving the brightness of the holographic content recording.
1 is a view provided to explain the method of recording a holographic wavefront in units of Hogel according to the SDE method,
2 is a diagram illustrating a subpixel concept of an LCD;
3 is a view showing a diffraction efficiency measurement result of a medium;
4 is a view provided to explain the concept of the present invention,
5 is a view showing the separation of only one Hogel,
FIG. 6 is a diagram provided to explain a concept of a method of recording a holographic wavefront in a hologram recording medium; FIG.
7 shows a driving scheme for holographic wavefront recording, and
8 shows a holographic printer capable of performing the above-described holographic wavefront recording.
Hereinafter, with reference to the drawings will be described the present invention in more detail.
4 is a view provided to explain the concept of the present invention. In order to help the understanding of the concept of the present invention, the left side of Figure 4 shows the conventional method, the right side of Figure 4 shows the method proposed in the present invention.
As shown on the left side of FIG. 4, in the conventional method, only one color is recorded on one hogel. That is, the first hogel records the holographic wavefront generated by injecting the red light source into the holographic fringe pattern, and the second hogel records the holographic wavefront generated by injecting the green light source into the holographic fringe pattern. Hogel records the holographic wavefront generated by injecting a blue light source into the holographic fringe pattern.
As a result, only the red component of the holographic wavefront is recorded on the first hogel, only the green component of the holographic wavefront is recorded on the second hogel, and only the blue component of the holographic wavefront is recorded on the third hogel.
As shown in the right side of Figure 4, in the holographic printing method according to an embodiment of the present invention, as in the conventional method, recording is made in units of Hogel.
However, the holographic printing method according to the embodiment of the present invention is different from the conventional method in which only one color is recorded on one hogel in that all colors are recorded in the SDE (Space Division Exposure) method even in one hogel.
To this end, the holographic printing method according to the present embodiment, after dividing the hologram recording medium to record the holographic wavefront generated from the holographic fringe pattern into a plurality of Hogel, each of the Hogels again a plurality of sub-hogel Split into
In FIG. 4, a situation of recording Red in the first sub-hogel, Green in the second sub-hogel, and Blue in the third sub-hogel was assumed.
The areas of the sub-hogels making up the hogel may be the same but may be different. The areas of the sub-hogels are determined by the hologram content generated when irradiating the holographic wavefront with reference light, which will be described in detail below.
5 shows only one Hogel separately. As shown in FIG. 5, since the longitudinal lengths of the sub-hogels are all the same, the area of the sub-hogels is determined by the width.
As shown in FIG. 5, the ratio of the area of the sub-hogel recorded in red, the area of the sub-hogel recorded in green, and the area of the sub-hogel recorded in blue is L R : L G : L B. . Where L R , L G , and L B are the ratios of the transverse lengths of the red, green, and blue sub-hogels.
This ratio is determined based on the color average value of the projected hologram image when the hologram generated by the holographic wavefront to be recorded on the hologram recording medium is projected onto the hogel composed of the corresponding sub-hogels.
For example, when the red, green, and blue mean values of the hologram image projected on the Hogel are 200, 100, and 50, respectively, L R : L G : L B = 200: 100: 50 = 4: 2: 1 do.
In another aspect, the ratio can also be seen to be determined by the color average values when the hologram produced by the holographic wavefront to be recorded on the hologram recording medium is observed in a hogel consisting of the corresponding sub-hogels.
Hereinafter, a method of recording the holographic wavefront of the corresponding color on the sub-hogels will be described in detail with reference to FIG. 6. FIG. 6 is a diagram provided to explain a concept of a method of recording a holographic wavefront on a hologram recording medium.
6 shows a method of recording a holographic wavefront in one hogel, and it can be seen that the recording is performed in units of sub-hogels. Specifically,
1) After reproducing the holographic free pattern to the SLM (Spatial Light Modulator) for generating the holographic wavefront to be recorded on the first sub-hogel, applying a red light source, the first of the hologram recording medium Record the red component of the holographic wavefront on the sub-hogel,
2) After reproducing the holographic free pattern to generate the holographic wavefront to be recorded on the second sub-hogel to the SLM, applying a green light source, the green of the holographic wavefront to the second sub-hogel of the hologram recording medium Record the ingredients,
3) After reproducing the holographic free pattern to generate the holographic wavefront to be recorded on the third sub-hogel to the SLM, a blue light source is applied to the blue of the holographic wavefront to the third sub-hogel of the hologram recording medium. The components will be recorded.
A driving scheme for holographic wavefront recording in accordance with the above scheme is shown in FIG. 7. As shown in FIG. 7, the optical system of the holographic printer is XY driven to adjust the holographic wavefront to be incident on the corresponding gel, and then recording is sequentially performed on red, green, and blue.
Specifically, 1) regenerate the holographic fringe pattern corresponding to the red component in the SLM, drive the red light source to perform recording on the first sub-hogel, and 2) the holographic fringe corresponding to the green component in the SLM. The pattern is reproduced, the green light source is driven to perform recording on the second sub-hogel, and 3) the holographic fringe pattern corresponding to the blue component in the SLM is reproduced, and the blue light source is driven to drive the third sub- Perform a record for Hogel.
In this process, the red, green, and blue light sources are irradiated with the maximum efficiency for each, thereby solving the problem of decrease in brightness. Thereafter, the optical system of the holographic printer is XY driven to adjust the holographic wavefront to enter the next hogel.
8 shows a holographic printer capable of performing the above-described holographic wavefront recording.
A holographic printer according to an embodiment of the present invention is a device for recording a holographic wavefront generated by a holographic fringe pattern applied through a
The
As shown in FIG. 8, the holographic printer according to an embodiment of the present invention includes a
The
The
The
As a result, a holographic wavefront is recorded on the
In addition, while the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.
10: computer
20: holographic emulsion
110: light source
120: SLM (Spatial Light Modulator)
130, 150: Lens
140: BPF (band pass filter)
Claims (6)
A second partitioning step of dividing each of the plurality of hogels into a plurality of sub-hogels; And
Recording a holographic wavefront of a corresponding color on the sub-hogels;
Areas of a plurality of sub-hogels constituting one hogel may be different from each other,
The plurality of sub-hogels constituting the one hogel,
A first sub-hogel in which the first color component is recorded, a second sub-hogel in which the second color component is recorded, and a third sub-hogel in which the third color component is recorded,
The area of the first sub-hogel, the area of the second sub-hogel and the area of the third sub-hogel are:
When the hologram generated by the holographic wavefront to be recorded on the hologram recording medium is projected onto a hogel consisting of the sub-hogels, a first color average value, a second color average value and a third color to be observed in the projected hologram image. Holographic printing method, characterized in that determined by the average value.
The recording step,
A method of holographic printing, characterized in that after finishing recording of sub-hogels constituting one hogel, the optical system is moved for recording on sub-hogels constituting the other hogel.
The recording step,
Recording at the maximum efficiency of the first color on the first sub-hogel;
Writing to the second sub-hogel at the maximum efficiency of the second color; And
And recording on the third sub-hogel at the maximum efficiency of the third color.
A second partitioning step of dividing each of the plurality of hogels into a plurality of sub-hogels; And
Recording a holographic wavefront of a corresponding color on the sub-hogels;
Areas of a plurality of sub-hogels constituting one hogel may be different from each other,
The plurality of sub-hogels constituting the one hogel,
A first sub-hogel in which the first color component is recorded, a second sub-hogel in which the second color component is recorded, and a third sub-hogel in which the third color component is recorded,
The area of the first sub-hogel, the area of the second sub-hogel and the area of the third sub-hogel are:
When the hologram generated by the holographic wavefront to be recorded on the hologram recording medium is projected onto a hogel consisting of the sub-hogels, a first color average value, a second color average value and a third color to be observed in the projected hologram image. A computer-readable recording medium having recorded thereon a program capable of performing a holographic printing method, characterized in that it is determined by an average value.
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| KR101901966B1 (en) * | 2016-10-24 | 2018-09-28 | 박지선 | System for digital holographic stereogram |
| KR102101896B1 (en) | 2018-06-29 | 2020-04-20 | 광운대학교 산학협력단 | Hogel Generation Method for Full-parallax Hologram |
| KR20200044541A (en) | 2018-10-19 | 2020-04-29 | 광운대학교 산학협력단 | Hologram generating apparatus capable of changing of hogel size |
| KR102289538B1 (en) * | 2019-11-13 | 2021-08-13 | 한국전자기술연구원 | System and method for printing of holographic stereogram using optical fiber |
| USD954368S1 (en) | 2020-03-26 | 2022-06-07 | Samsung Electronics Co., Ltd. | Drying machine |
| KR102522950B1 (en) | 2020-07-15 | 2023-04-19 | 광운대학교 산학협력단 | Apparatus for evaluating quality of holographic optical element |
| USD958850S1 (en) | 2020-10-14 | 2022-07-26 | Samsung Electronics Co., Ltd. | Refrigerator |
| KR102551957B1 (en) * | 2020-12-28 | 2023-07-06 | 한국전자기술연구원 | 3D Image Rendering Method for Holographic Printer |
| KR20230015759A (en) * | 2021-07-23 | 2023-01-31 | 주식회사 홀로랩 | Method and system for manufacturing digital holographic screen based on multi-hogel printing |
| KR102624397B1 (en) | 2021-11-19 | 2024-01-15 | 한국과학기술연구원 | Artificial intelligence learning method for restoring holography |
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| KR101423163B1 (en) * | 2012-11-19 | 2014-07-28 | 전자부품연구원 | Holographic Printer for Filtering Holographic Fringe Pattern and Recording That on Holographic Recording Medium by the Hogel and Holographic Printing Method thereof |
| KR102040657B1 (en) * | 2012-12-12 | 2019-11-05 | 엘지디스플레이 주식회사 | Spatial Light Modulating Panel And Holography 3D Display Using The Same |
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